Denis O'Hare, pictured at the premiere of "American Horror Story" Season 4 in Hollywood on October 5, revealed that production on Season 5 begins Monday. Photo: Getty

The cast of “American Horror Story” Season 5 will begin to check into “Hotel” on Monday! Returning actor Denis O’Hare confirmed the good news on Twitter on Thursday.

O’Hare spent a few days in Italy, visiting Genova and Turin. When a fan tweeted and asked him to visit Milan, the actor responded that he couldn’t due to prior obligations … “American Horror Story.”

“Would love that,” he replied. “But I have to go back to US and start work on AHS-Hotel on Monday.”

It’s not clear where O’Hare and the rest of the cast will be, or if filming will start on Monday. Series co-creator Ryan Murphy previously revealed at PaleyFest in March that filming wouldn’t begin until August. Production for the FX anthology is set to return to Los Angeles after the last two seasons, “Coven” and “Freak Show,” were filmed in New Orleans. A six-story hotel for Season 5 is being built on the Fox lot.

O’Hare, who previously starred in Season 1, Season 3 and Season 4, was cast in “Hotel” in mid-June. No details about his character have been released. The actor will join fellow returning stars Angela Bassett, Kathy Bates, Wes Bentley, Matt Bomer, Sarah Paulson, Evan Peters, Emma Roberts, Chlöe Sevigny and Finn Wittrock. Newcomers to the franchise include Lady Gaga, Max Greenfield and Cheyenne Jackson.

New details about “American Horror Story: Hotel” are speculated to be announced at the San Diego Comic-Con panel on Sunday, July 12.